OpenBSD-4.6/usr.sbin/user/user.c
/* $OpenBSD: user.c,v 1.77 2009/02/08 11:37:43 chl Exp $ */
/* $NetBSD: user.c,v 1.69 2003/04/14 17:40:07 agc Exp $ */
/*
* Copyright (c) 1999 Alistair G. Crooks. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by Alistair G. Crooks.
* 4. The name of the author may not be used to endorse or promote
* products derived from this software without specific prior written
* permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS
* OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
* GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <sys/param.h>
#include <sys/stat.h>
#include <ctype.h>
#include <dirent.h>
#include <err.h>
#include <fcntl.h>
#include <grp.h>
#ifdef EXTENSIONS
#include <login_cap.h>
#endif
#include <paths.h>
#include <pwd.h>
#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <syslog.h>
#include <time.h>
#include <unistd.h>
#include <util.h>
#include "defs.h"
#include "usermgmt.h"
/* this struct describes a uid range */
typedef struct range_t {
uid_t r_from; /* low uid */
uid_t r_to; /* high uid */
} range_t;
/* this struct encapsulates the user information */
typedef struct user_t {
int u_flags; /* see below */
uid_t u_uid; /* uid of user */
char *u_password; /* encrypted password */
char *u_comment; /* comment field */
char *u_home; /* home directory */
char *u_primgrp; /* primary group */
int u_groupc; /* # of secondary groups */
const char *u_groupv[NGROUPS_MAX]; /* secondary groups */
char *u_shell; /* user's shell */
char *u_basedir; /* base directory for home */
char *u_expire; /* when account will expire */
char *u_inactive; /* when password will expire */
char *u_skeldir; /* directory for startup files */
char *u_class; /* login class */
unsigned int u_rsize; /* size of range array */
unsigned int u_rc; /* # of ranges */
range_t *u_rv; /* the ranges */
unsigned int u_defrc; /* # of ranges in defaults */
int u_preserve; /* preserve uids on deletion */
} user_t;
/* flags for which fields of the user_t replace the passwd entry */
enum {
F_COMMENT = 0x0001,
F_DUPUID = 0x0002,
F_EXPIRE = 0x0004,
F_GROUP = 0x0008,
F_HOMEDIR = 0x0010,
F_MKDIR = 0x0020,
F_INACTIVE = 0x0040,
F_PASSWORD = 0x0080,
F_SECGROUP = 0x0100,
F_SHELL = 0x0200,
F_UID = 0x0400,
F_USERNAME = 0x0800,
F_CLASS = 0x1000
};
#define CONFFILE "/etc/usermgmt.conf"
#ifndef DEF_GROUP
#define DEF_GROUP "users"
#endif
#ifndef DEF_BASEDIR
#define DEF_BASEDIR "/home"
#endif
#ifndef DEF_SKELDIR
#define DEF_SKELDIR "/etc/skel"
#endif
#ifndef DEF_SHELL
#define DEF_SHELL _PATH_KSHELL
#endif
#ifndef DEF_COMMENT
#define DEF_COMMENT ""
#endif
#ifndef DEF_LOWUID
#define DEF_LOWUID 1000
#endif
#ifndef DEF_HIGHUID
#define DEF_HIGHUID 60000
#endif
#ifndef DEF_INACTIVE
#define DEF_INACTIVE 0
#endif
#ifndef DEF_EXPIRE
#define DEF_EXPIRE NULL
#endif
#ifndef DEF_CLASS
#define DEF_CLASS ""
#endif
#ifndef WAITSECS
#define WAITSECS 10
#endif
#ifndef NOBODY_UID
#define NOBODY_UID 32767
#endif
/* some useful constants */
enum {
MaxShellNameLen = 256,
MaxFileNameLen = MAXPATHLEN,
MaxUserNameLen = _PW_NAME_LEN,
MaxCommandLen = 2048,
PasswordLength = _PASSWORD_LEN,
DES_Len = 13,
LowGid = DEF_LOWUID,
HighGid = DEF_HIGHUID
};
/* Full paths of programs used here */
#define CHMOD "/bin/chmod"
#define CHOWN "/sbin/chown"
#define MKDIR "/bin/mkdir"
#define MV "/bin/mv"
#define NOLOGIN "/sbin/nologin"
#define PAX "/bin/pax"
#define RM "/bin/rm"
#define UNSET_INACTIVE "Null (unset)"
#define UNSET_EXPIRY "Null (unset)"
static int asystem(const char *fmt, ...)
__attribute__((__format__(__printf__, 1, 2)));
static int verbose;
/* if *cpp is non-null, free it, then assign `n' chars of `s' to it */
static void
memsave(char **cpp, const char *s, size_t n)
{
if (*cpp != NULL) {
FREE(*cpp);
}
NEWARRAY(char, *cpp, n + 1, exit(1));
(void) memcpy(*cpp, s, n);
(*cpp)[n] = '\0';
}
/* a replacement for system(3) */
static int
asystem(const char *fmt, ...)
{
va_list vp;
char buf[MaxCommandLen];
int ret;
va_start(vp, fmt);
(void) vsnprintf(buf, sizeof(buf), fmt, vp);
va_end(vp);
if (verbose) {
(void) printf("Command: %s\n", buf);
}
if ((ret = system(buf)) != 0) {
warnx("[Warning] can't system `%s'", buf);
}
return ret;
}
/* remove a users home directory, returning 1 for success (ie, no problems encountered) */
static int
removehomedir(const char *user, uid_t uid, const char *dir)
{
struct stat st;
/* userid not root? */
if (uid == 0) {
warnx("Not deleting home directory `%s'; userid is 0", dir);
return 0;
}
/* directory exists (and is a directory!) */
if (stat(dir, &st) < 0) {
warnx("Home directory `%s' doesn't exist", dir);
return 0;
}
if (!S_ISDIR(st.st_mode)) {
warnx("Home directory `%s' is not a directory", dir);
return 0;
}
/* userid matches directory owner? */
if (st.st_uid != uid) {
warnx("User `%s' doesn't own directory `%s', not removed",
user, dir);
return 0;
}
(void) seteuid(uid);
/* we add the "|| true" to keep asystem() quiet if there is a non-zero exit status. */
(void) asystem("%s -rf %s > /dev/null 2>&1 || true", RM, dir);
(void) seteuid(0);
if (rmdir(dir) < 0) {
warnx("Unable to remove all files in `%s'", dir);
return 0;
}
return 1;
}
/* return 1 if all of `s' is numeric */
static int
is_number(char *s)
{
for ( ; *s ; s++) {
if (!isdigit((unsigned char) *s)) {
return 0;
}
}
return 1;
}
/*
* check that the effective uid is 0 - called from funcs which will
* modify data and config files.
*/
static void
checkeuid(void)
{
if (geteuid() != 0) {
errx(EXIT_FAILURE, "Program must be run as root");
}
}
/* copy any dot files into the user's home directory */
static int
copydotfiles(char *skeldir, uid_t uid, gid_t gid, char *dir)
{
struct dirent *dp;
DIR *dirp;
int n;
if ((dirp = opendir(skeldir)) == NULL) {
warn("can't open source . files dir `%s'", skeldir);
return 0;
}
for (n = 0; (dp = readdir(dirp)) != NULL && n == 0 ; ) {
if (strcmp(dp->d_name, ".") == 0 ||
strcmp(dp->d_name, "..") == 0) {
continue;
}
n = 1;
}
(void) closedir(dirp);
if (n == 0) {
warnx("No \"dot\" initialisation files found");
} else {
(void) asystem("cd %s && %s -rw -pe %s . %s",
skeldir, PAX, (verbose) ? "-v" : "", dir);
}
(void) asystem("%s -R -P %u:%u %s", CHOWN, uid, gid, dir);
(void) asystem("%s -R u+w %s", CHMOD, dir);
return n;
}
/* create a group entry with gid `gid' */
static int
creategid(char *group, gid_t gid, const char *name)
{
struct stat st;
FILE *from;
FILE *to;
char *buf;
char f[MaxFileNameLen];
int fd, ret;
int wroteit = 0;
size_t len;
if (getgrnam(group) != NULL) {
warnx("group `%s' already exists", group);
return 0;
}
if ((from = fopen(_PATH_GROUP, "r")) == NULL) {
warn("can't create gid for `%s': can't open `%s'", group,
_PATH_GROUP);
return 0;
}
if (flock(fileno(from), LOCK_EX | LOCK_NB) < 0) {
warn("can't lock `%s'", _PATH_GROUP);
}
(void) fstat(fileno(from), &st);
(void) snprintf(f, sizeof(f), "%s.XXXXXXXX", _PATH_GROUP);
if ((fd = mkstemp(f)) < 0) {
(void) fclose(from);
warn("can't create gid: mkstemp failed");
return 0;
}
if ((to = fdopen(fd, "w")) == NULL) {
(void) fclose(from);
(void) close(fd);
(void) unlink(f);
warn("can't create gid: fdopen `%s' failed", f);
return 0;
}
while ((buf = fgetln(from, &len)) != NULL && len > 0) {
ret = 0;
if (buf[0] == '+' && wroteit == 0) {
ret = fprintf(to, "%s:*:%u:%s\n", group, gid, name);
wroteit = 1;
}
if (ret == -1 ||
fprintf(to, "%*.*s", (int)len, (int)len, buf) != len) {
(void) fclose(from);
(void) fclose(to);
(void) unlink(f);
warn("can't create gid: short write to `%s'", f);
return 0;
}
}
ret = 0;
if (wroteit == 0)
ret = fprintf(to, "%s:*:%u:%s\n", group, gid, name);
(void) fclose(from);
if (fclose(to) == EOF || ret == -1) {
(void) unlink(f);
warn("can't create gid: short write to `%s'", f);
return 0;
}
if (rename(f, _PATH_GROUP) < 0) {
(void) unlink(f);
warn("can't create gid: can't rename `%s' to `%s'", f,
_PATH_GROUP);
return 0;
}
(void) chmod(_PATH_GROUP, st.st_mode & 07777);
syslog(LOG_INFO, "new group added: name=%s, gid=%d", group, gid);
return 1;
}
/* modify the group entry with name `group' to be newent */
static int
modify_gid(char *group, char *newent)
{
struct stat st;
FILE *from;
FILE *to;
char buf[LINE_MAX];
char f[MaxFileNameLen];
char *colon;
int groupc;
int entc;
int fd;
int cc;
if ((from = fopen(_PATH_GROUP, "r")) == NULL) {
warn("can't modify gid for `%s': can't open `%s'", group,
_PATH_GROUP);
return 0;
}
if (flock(fileno(from), LOCK_EX | LOCK_NB) < 0) {
warn("can't lock `%s'", _PATH_GROUP);
}
(void) fstat(fileno(from), &st);
(void) snprintf(f, sizeof(f), "%s.XXXXXXXX", _PATH_GROUP);
if ((fd = mkstemp(f)) < 0) {
(void) fclose(from);
warn("can't modify gid: mkstemp failed");
return 0;
}
if ((to = fdopen(fd, "w")) == NULL) {
(void) fclose(from);
(void) close(fd);
(void) unlink(f);
warn("can't modify gid: fdopen `%s' failed", f);
return 0;
}
groupc = strlen(group);
while (fgets(buf, sizeof(buf), from) != NULL) {
cc = strlen(buf);
if (cc > 0 && buf[cc - 1] != '\n' && !feof(from)) {
while (fgetc(from) != '\n' && !feof(from))
cc++;
warn("%s: line `%s' too long (%d bytes), skipping",
_PATH_GROUP, buf, cc);
continue;
}
if ((colon = strchr(buf, ':')) == NULL) {
warn("badly formed entry `%s'", buf);
continue;
}
entc = (int)(colon - buf);
if (entc == groupc && strncmp(group, buf, entc) == 0) {
if (newent == NULL) {
continue;
} else {
cc = strlcpy(buf, newent, sizeof(buf));
if (cc >= sizeof(buf)) {
warnx("group `%s' entry too long", newent);
return (0);
}
}
}
if (fwrite(buf, cc, 1, to) != 1) {
(void) fclose(from);
(void) fclose(to);
(void) unlink(f);
warn("can't modify gid: short write to `%s'", f);
return 0;
}
}
(void) fclose(from);
if (fclose(to) == EOF) {
(void) unlink(f);
warn("can't modify gid: short write to `%s'", f);
return 0;
}
if (rename(f, _PATH_GROUP) < 0) {
(void) unlink(f);
warn("can't modify gid: can't rename `%s' to `%s'", f, _PATH_GROUP);
return 0;
}
(void) chmod(_PATH_GROUP, st.st_mode & 07777);
if (newent == NULL) {
syslog(LOG_INFO, "group deleted: name=%s", group);
} else {
syslog(LOG_INFO, "group information modified: name=%s", group);
}
return 1;
}
/* modify the group entries for all `groups', by adding `user' */
static int
append_group(char *user, int ngroups, const char **groups)
{
struct group *grp;
struct stat st;
FILE *from;
FILE *to;
char buf[LINE_MAX];
char f[MaxFileNameLen];
char *colon;
int fd;
int cc;
int i;
int j;
for (i = 0 ; i < ngroups ; i++) {
if ((grp = getgrnam(groups[i])) == NULL) {
warnx("can't append group `%s' for user `%s'",
groups[i], user);
} else {
for (j = 0 ; grp->gr_mem[j] ; j++) {
if (strcmp(user, grp->gr_mem[j]) == 0) {
/* already in it */
groups[i] = "";
}
}
}
}
if ((from = fopen(_PATH_GROUP, "r")) == NULL) {
warn("can't append group for `%s': can't open `%s'", user,
_PATH_GROUP);
return 0;
}
if (flock(fileno(from), LOCK_EX | LOCK_NB) < 0) {
warn("can't lock `%s'", _PATH_GROUP);
}
(void) fstat(fileno(from), &st);
(void) snprintf(f, sizeof(f), "%s.XXXXXXXX", _PATH_GROUP);
if ((fd = mkstemp(f)) < 0) {
(void) fclose(from);
warn("can't append group: mkstemp failed");
return 0;
}
if ((to = fdopen(fd, "w")) == NULL) {
(void) fclose(from);
(void) close(fd);
(void) unlink(f);
warn("can't append group: fdopen `%s' failed", f);
return 0;
}
while (fgets(buf, sizeof(buf), from) != NULL) {
cc = strlen(buf);
if (cc > 0 && buf[cc - 1] != '\n' && !feof(from)) {
while (fgetc(from) != '\n' && !feof(from))
cc++;
warn("%s: line `%s' too long (%d bytes), skipping",
_PATH_GROUP, buf, cc);
continue;
}
if ((colon = strchr(buf, ':')) == NULL) {
warnx("badly formed entry `%s'", buf);
continue;
}
for (i = 0 ; i < ngroups ; i++) {
j = (int)(colon - buf);
if (strncmp(groups[i], buf, j) == 0 &&
groups[i][j] == '\0') {
while (isspace(buf[cc - 1]))
cc--;
buf[(j = cc)] = '\0';
if (buf[strlen(buf) - 1] != ':')
strlcat(buf, ",", sizeof(buf));
cc = strlcat(buf, user, sizeof(buf)) + 1;
if (cc >= sizeof(buf)) {
warnx("Warning: group `%s' would "
"become too long, not modifying",
groups[i]);
cc = j + 1;
}
buf[cc - 1] = '\n';
buf[cc] = '\0';
}
}
if (fwrite(buf, cc, 1, to) != 1) {
(void) fclose(from);
(void) fclose(to);
(void) unlink(f);
warn("can't append group: short write to `%s'", f);
return 0;
}
}
(void) fclose(from);
if (fclose(to) == EOF) {
(void) unlink(f);
warn("can't append group: short write to `%s'", f);
return 0;
}
if (rename(f, _PATH_GROUP) < 0) {
(void) unlink(f);
warn("can't append group: can't rename `%s' to `%s'", f, _PATH_GROUP);
return 0;
}
(void) chmod(_PATH_GROUP, st.st_mode & 07777);
return 1;
}
/* return 1 if `login' is a valid login name */
static int
valid_login(char *login_name)
{
unsigned char *cp;
/* The first character cannot be a hyphen */
if (*login_name == '-')
return 0;
for (cp = login_name ; *cp ; cp++) {
/* We allow '$' as the last character for samba */
if (!isalnum(*cp) && *cp != '.' && *cp != '_' && *cp != '-' &&
!(*cp == '$' && *(cp + 1) == '\0')) {
return 0;
}
}
if ((char *)cp - login_name > MaxUserNameLen)
return 0;
return 1;
}
/* return 1 if `group' is a valid group name */
static int
valid_group(char *group)
{
unsigned char *cp;
for (cp = group ; *cp ; cp++) {
if (!isalnum(*cp) && *cp != '.' && *cp != '_' && *cp != '-') {
return 0;
}
}
if ((char *)cp - group > MaxUserNameLen)
return 0;
return 1;
}
#ifdef EXTENSIONS
/* return 1 if `class' exists */
static int
valid_class(char *class)
{
login_cap_t *lc;
if ((lc = login_getclass(class)) != NULL)
login_close(lc);
return lc != NULL;
}
#endif
/* find the next gid in the range lo .. hi */
static int
getnextgid(uid_t *gidp, uid_t lo, uid_t hi)
{
for (*gidp = lo ; *gidp < hi ; *gidp += 1) {
if (getgrgid((gid_t)*gidp) == NULL) {
return 1;
}
}
return 0;
}
#ifdef EXTENSIONS
/* save a range of uids */
static int
save_range(user_t *up, char *cp)
{
int from;
int to;
int i;
if (up->u_rsize == 0) {
up->u_rsize = 32;
NEWARRAY(range_t, up->u_rv, up->u_rsize, return(0));
} else if (up->u_rc == up->u_rsize) {
up->u_rsize *= 2;
RENEW(range_t, up->u_rv, up->u_rsize, return(0));
}
if (up->u_rv && sscanf(cp, "%d..%d", &from, &to) == 2) {
for (i = up->u_defrc ; i < up->u_rc ; i++) {
if (up->u_rv[i].r_from == from && up->u_rv[i].r_to == to) {
break;
}
}
if (i == up->u_rc) {
up->u_rv[up->u_rc].r_from = from;
up->u_rv[up->u_rc].r_to = to;
up->u_rc += 1;
}
} else {
warnx("Bad range `%s'", cp);
return 0;
}
return 1;
}
#endif
/* set the defaults in the defaults file */
static int
setdefaults(user_t *up)
{
char template[MaxFileNameLen];
FILE *fp;
int ret;
int fd;
#ifdef EXTENSIONS
int i;
#endif
(void) snprintf(template, sizeof(template), "%s.XXXXXXXX", CONFFILE);
if ((fd = mkstemp(template)) < 0) {
warnx("can't mkstemp `%s' for writing", CONFFILE);
return 0;
}
if ((fp = fdopen(fd, "w")) == NULL) {
warn("can't fdopen `%s' for writing", CONFFILE);
return 0;
}
ret = 1;
if (fprintf(fp, "group\t\t%s\n", up->u_primgrp) <= 0 ||
fprintf(fp, "base_dir\t%s\n", up->u_basedir) <= 0 ||
fprintf(fp, "skel_dir\t%s\n", up->u_skeldir) <= 0 ||
fprintf(fp, "shell\t\t%s\n", up->u_shell) <= 0 ||
#ifdef EXTENSIONS
fprintf(fp, "class\t\t%s\n", up->u_class) <= 0 ||
#endif
fprintf(fp, "inactive\t%s\n", (up->u_inactive == NULL) ? UNSET_INACTIVE : up->u_inactive) <= 0 ||
fprintf(fp, "expire\t\t%s\n", (up->u_expire == NULL) ? UNSET_EXPIRY : up->u_expire) <= 0 ||
fprintf(fp, "preserve\t%s\n", (up->u_preserve == 0) ? "false" : "true") <= 0) {
warn("can't write to `%s'", CONFFILE);
ret = 0;
}
#ifdef EXTENSIONS
for (i = (up->u_defrc != up->u_rc) ? up->u_defrc : 0 ; i < up->u_rc ; i++) {
if (fprintf(fp, "range\t\t%d..%d\n", up->u_rv[i].r_from, up->u_rv[i].r_to) <= 0) {
warn("can't write to `%s'", CONFFILE);
ret = 0;
}
}
#endif
if (fclose(fp) == EOF) {
warn("can't write to `%s'", CONFFILE);
ret = 0;
}
if (ret) {
ret = ((rename(template, CONFFILE) == 0) && (chmod(CONFFILE, 0644) == 0));
}
return ret;
}
/* read the defaults file */
static void
read_defaults(user_t *up)
{
struct stat st;
size_t lineno;
size_t len;
FILE *fp;
unsigned char *cp;
unsigned char *s;
memsave(&up->u_primgrp, DEF_GROUP, strlen(DEF_GROUP));
memsave(&up->u_basedir, DEF_BASEDIR, strlen(DEF_BASEDIR));
memsave(&up->u_skeldir, DEF_SKELDIR, strlen(DEF_SKELDIR));
memsave(&up->u_shell, DEF_SHELL, strlen(DEF_SHELL));
memsave(&up->u_comment, DEF_COMMENT, strlen(DEF_COMMENT));
#ifdef EXTENSIONS
memsave(&up->u_class, DEF_CLASS, strlen(DEF_CLASS));
#endif
up->u_rsize = 16;
up->u_defrc = 0;
NEWARRAY(range_t, up->u_rv, up->u_rsize, exit(1));
up->u_inactive = DEF_INACTIVE;
up->u_expire = DEF_EXPIRE;
if ((fp = fopen(CONFFILE, "r")) == NULL) {
if (stat(CONFFILE, &st) < 0 && !setdefaults(up)) {
warn("can't create `%s' defaults file", CONFFILE);
}
fp = fopen(CONFFILE, "r");
}
if (fp != NULL) {
while ((s = fparseln(fp, &len, &lineno, NULL, 0)) != NULL) {
if (strncmp(s, "group", 5) == 0) {
for (cp = s + 5 ; isspace(*cp) ; cp++) {
}
memsave(&up->u_primgrp, cp, strlen(cp));
} else if (strncmp(s, "base_dir", 8) == 0) {
for (cp = s + 8 ; isspace(*cp) ; cp++) {
}
memsave(&up->u_basedir, cp, strlen(cp));
} else if (strncmp(s, "skel_dir", 8) == 0) {
for (cp = s + 8 ; isspace(*cp) ; cp++) {
}
memsave(&up->u_skeldir, cp, strlen(cp));
} else if (strncmp(s, "shell", 5) == 0) {
for (cp = s + 5 ; isspace(*cp) ; cp++) {
}
memsave(&up->u_shell, cp, strlen(cp));
} else if (strncmp(s, "password", 8) == 0) {
for (cp = s + 8 ; isspace(*cp) ; cp++) {
}
memsave(&up->u_password, cp, strlen(cp));
#ifdef EXTENSIONS
} else if (strncmp(s, "class", 5) == 0) {
for (cp = s + 5 ; isspace(*cp) ; cp++) {
}
memsave(&up->u_class, cp, strlen(cp));
#endif
} else if (strncmp(s, "inactive", 8) == 0) {
for (cp = s + 8 ; isspace(*cp) ; cp++) {
}
if (strcmp(cp, UNSET_INACTIVE) == 0) {
if (up->u_inactive) {
FREE(up->u_inactive);
}
up->u_inactive = NULL;
} else {
memsave(&up->u_inactive, cp, strlen(cp));
}
#ifdef EXTENSIONS
} else if (strncmp(s, "range", 5) == 0) {
for (cp = s + 5 ; isspace(*cp) ; cp++) {
}
(void) save_range(up, cp);
#endif
#ifdef EXTENSIONS
} else if (strncmp(s, "preserve", 8) == 0) {
for (cp = s + 8 ; isspace(*cp) ; cp++) {
}
up->u_preserve = (strncmp(cp, "true", 4) == 0) ? 1 :
(strncmp(cp, "yes", 3) == 0) ? 1 :
atoi(cp);
#endif
} else if (strncmp(s, "expire", 6) == 0) {
for (cp = s + 6 ; isspace(*cp) ; cp++) {
}
if (strcmp(cp, UNSET_EXPIRY) == 0) {
if (up->u_expire) {
FREE(up->u_expire);
}
up->u_expire = NULL;
} else {
memsave(&up->u_expire, cp, strlen(cp));
}
}
(void) free(s);
}
(void) fclose(fp);
}
if (up->u_rc == 0) {
up->u_rv[up->u_rc].r_from = DEF_LOWUID;
up->u_rv[up->u_rc].r_to = DEF_HIGHUID;
up->u_rc += 1;
}
up->u_defrc = up->u_rc;
}
/* return the next valid unused uid */
static int
getnextuid(int sync_uid_gid, uid_t *uid, uid_t low_uid, uid_t high_uid)
{
for (*uid = low_uid ; *uid <= high_uid ; (*uid)++) {
if (getpwuid((uid_t)(*uid)) == NULL && *uid != NOBODY_UID) {
if (sync_uid_gid) {
if (getgrgid((gid_t)(*uid)) == NULL) {
return 1;
}
} else {
return 1;
}
}
}
return 0;
}
/* structure which defines a password type */
typedef struct passwd_type_t {
const char *type; /* optional type descriptor */
int desc_length; /* length of type descriptor */
int length; /* length of password */
} passwd_type_t;
#define BLF "$2a"
#define MD5 "$1"
#define DES ""
static passwd_type_t passwd_types[] = {
{ BLF, 3, 54 }, /* Blowfish */
{ MD5, 2, 34 }, /* MD5 */
{ DES, 0, DES_Len }, /* standard DES */
{ NULL, -1, -1 } /* none - terminate search */
};
/* return non-zero if it's a valid password - check length for cipher type */
static int
valid_password_length(char *newpasswd)
{
passwd_type_t *pwtp;
for (pwtp = passwd_types ; pwtp->desc_length >= 0 ; pwtp++) {
if (strncmp(newpasswd, pwtp->type, pwtp->desc_length) == 0) {
char *p;
if (strcmp(pwtp->type, BLF) != 0) {
return strlen(newpasswd) == pwtp->length;
}
/* Skip first three `$'. */
if ((p = strchr(newpasswd, '$')) == NULL ||
*(++p) == '$' || (p = strchr(p, '$')) == NULL ||
*(++p) == '$' || (p = strchr(p, '$')) == NULL)
continue;
return (strlen(p) - 1);
}
}
return 0;
}
/* look for a valid time, return 0 if it was specified but bad */
static int
scantime(time_t *tp, char *s)
{
struct tm tm;
*tp = 0;
if (s != NULL) {
(void) memset(&tm, 0, sizeof(tm));
tm.tm_isdst = -1;
if (strptime(s, "%c", &tm) != NULL) {
*tp = mktime(&tm);
} else if (strptime(s, "%B %d %Y", &tm) != NULL) {
*tp = mktime(&tm);
} else if (isdigit((unsigned char) s[0]) != NULL) {
*tp = atoi(s);
} else {
return 0;
}
}
return 1;
}
/* compute the extra length '&' expansion consumes */
static size_t
expand_len(const char *p, const char *username)
{
size_t alen;
size_t ulen;
ulen = strlen(username);
for (alen = 0; *p != '\0'; p++)
if (*p == '&')
alen += ulen - 1;
return alen;
}
/* add a user */
static int
adduser(char *login_name, user_t *up)
{
struct group *grp;
struct stat st;
time_t expire;
time_t inactive;
char password[PasswordLength + 1];
char home[MaxFileNameLen];
char buf[LINE_MAX];
int sync_uid_gid;
int masterfd;
int ptmpfd;
gid_t gid;
int cc;
int i, yp = 0;
FILE *fp;
if (!valid_login(login_name)) {
errx(EXIT_FAILURE, "`%s' is not a valid login name", login_name);
}
#ifdef EXTENSIONS
if (!valid_class(up->u_class)) {
errx(EXIT_FAILURE, "No such login class `%s'", up->u_class);
}
#endif
if ((masterfd = open(_PATH_MASTERPASSWD, O_RDONLY)) < 0) {
err(EXIT_FAILURE, "can't open `%s'", _PATH_MASTERPASSWD);
}
if (flock(masterfd, LOCK_EX | LOCK_NB) < 0) {
err(EXIT_FAILURE, "can't lock `%s'", _PATH_MASTERPASSWD);
}
pw_init();
if ((ptmpfd = pw_lock(WAITSECS)) < 0) {
(void) close(masterfd);
err(EXIT_FAILURE, "can't obtain pw_lock");
}
if ((fp = fdopen(masterfd, "r")) == NULL) {
(void) close(masterfd);
(void) close(ptmpfd);
pw_abort();
err(EXIT_FAILURE, "can't fdopen `%s' for reading",
_PATH_MASTERPASSWD);
}
while (fgets(buf, sizeof(buf), fp) != NULL) {
cc = strlen(buf);
/*
* Stop copying the file at the yp entry; we want to
* put the new user before it, and preserve entries
* after the yp entry.
*/
if (cc > 1 && buf[0] == '+' && buf[1] == ':') {
yp = 1;
break;
}
if (write(ptmpfd, buf, (size_t)(cc)) != cc) {
(void) fclose(fp);
(void) close(ptmpfd);
pw_abort();
err(EXIT_FAILURE, "short write to /etc/ptmp (not %d chars)", cc);
}
}
if (ferror(fp)) {
(void) fclose(fp);
(void) close(ptmpfd);
pw_abort();
err(EXIT_FAILURE, "read error on %s", _PATH_MASTERPASSWD);
}
/* if no uid was specified, get next one in [low_uid..high_uid] range */
sync_uid_gid = (strcmp(up->u_primgrp, "=uid") == 0);
if (up->u_uid == UID_MAX) {
int got_id = 0;
/*
* Look for a free UID in the command line ranges (if any).
* These start after the ranges specified in the config file.
*/
for (i = up->u_defrc; got_id == 0 && i < up->u_rc ; i++) {
got_id = getnextuid(sync_uid_gid, &up->u_uid,
up->u_rv[i].r_from, up->u_rv[i].r_to);
}
/*
* If there were no free UIDs in the command line ranges,
* try the ranges from the config file (there will always
* be at least one default).
*/
if (got_id == 0) {
for (i = 0; got_id == 0 && i < up->u_defrc; i++) {
got_id = getnextuid(sync_uid_gid, &up->u_uid,
up->u_rv[i].r_from, up->u_rv[i].r_to);
}
}
if (got_id == 0) {
(void) close(ptmpfd);
pw_abort();
errx(EXIT_FAILURE, "can't get next uid for %u", up->u_uid);
}
}
/* check uid isn't already allocated */
if (!(up->u_flags & F_DUPUID) && getpwuid((uid_t)(up->u_uid)) != NULL) {
(void) close(ptmpfd);
pw_abort();
errx(EXIT_FAILURE, "uid %u is already in use", up->u_uid);
}
/* if -g=uid was specified, check gid is unused */
if (sync_uid_gid) {
if (getgrgid((gid_t)(up->u_uid)) != NULL) {
(void) close(ptmpfd);
pw_abort();
errx(EXIT_FAILURE, "gid %u is already in use", up->u_uid);
}
gid = up->u_uid;
} else if ((grp = getgrnam(up->u_primgrp)) != NULL) {
gid = grp->gr_gid;
} else if (is_number(up->u_primgrp) &&
(grp = getgrgid((gid_t)atoi(up->u_primgrp))) != NULL) {
gid = grp->gr_gid;
} else {
(void) close(ptmpfd);
pw_abort();
errx(EXIT_FAILURE, "group %s not found", up->u_primgrp);
}
/* check name isn't already in use */
if (!(up->u_flags & F_DUPUID) && getpwnam(login_name) != NULL) {
(void) close(ptmpfd);
pw_abort();
errx(EXIT_FAILURE, "already a `%s' user", login_name);
}
if (up->u_flags & F_HOMEDIR) {
if (strlcpy(home, up->u_home, sizeof(home)) >= sizeof(home)) {
(void) close(ptmpfd);
pw_abort();
errx(EXIT_FAILURE, "home directory `%s' too long",
up->u_home);
}
} else {
/* if home directory hasn't been given, make it up */
if (snprintf(home, sizeof(home), "%s/%s", up->u_basedir,
login_name) >= sizeof(home)) {
(void) close(ptmpfd);
pw_abort();
errx(EXIT_FAILURE, "home directory `%s/%s' too long",
up->u_basedir, login_name);
}
}
if (!scantime(&inactive, up->u_inactive)) {
warnx("Warning: inactive time `%s' invalid, password expiry off",
up->u_inactive);
}
if (!scantime(&expire, up->u_expire)) {
warnx("Warning: expire time `%s' invalid, account expiry off",
up->u_expire);
}
if (lstat(home, &st) < 0 && !(up->u_flags & F_MKDIR) &&
strcmp(home, _PATH_NONEXISTENT) != 0) {
warnx("Warning: home directory `%s' doesn't exist, and -m was"
" not specified", home);
}
if (up->u_password != NULL && valid_password_length(up->u_password)) {
(void) strlcpy(password, up->u_password, sizeof(password));
} else {
(void) memset(password, '*', DES_Len);
password[DES_Len] = 0;
if (up->u_password != NULL) {
warnx("Password `%s' is invalid: setting it to `%s'",
up->u_password, password);
}
}
cc = snprintf(buf, sizeof(buf), "%s:%s:%d:%d:%s:%ld:%ld:%s:%s:%s\n",
login_name,
password,
up->u_uid,
gid,
#ifdef EXTENSIONS
up->u_class,
#else
"",
#endif
(long) inactive,
(long) expire,
up->u_comment,
home,
up->u_shell);
if (cc >= sizeof(buf) || cc < 0 ||
cc + expand_len(up->u_comment, login_name) >= 1023) {
(void) close(ptmpfd);
pw_abort();
errx(EXIT_FAILURE, "can't add `%s', line too long", buf);
}
if (write(ptmpfd, buf, (size_t) cc) != cc) {
(void) close(ptmpfd);
pw_abort();
err(EXIT_FAILURE, "can't add `%s'", buf);
}
if (yp) {
/* put back the + line */
cc = snprintf(buf, sizeof(buf), "+:*::::::::\n");
if (cc == -1 || cc >= sizeof(buf)) {
(void) close(ptmpfd);
pw_abort();
errx(EXIT_FAILURE, "can't add `%s', line too long", buf);
}
if (write(ptmpfd, buf, (size_t) cc) != cc) {
(void) close(ptmpfd);
pw_abort();
err(EXIT_FAILURE, "can't add `%s'", buf);
}
/* copy the entries following it, if any */
while (fgets(buf, sizeof(buf), fp) != NULL) {
cc = strlen(buf);
if (write(ptmpfd, buf, (size_t)(cc)) != cc) {
(void) fclose(fp);
(void) close(ptmpfd);
pw_abort();
err(EXIT_FAILURE, "short write to /etc/ptmp (not %d chars)", cc);
}
}
if (ferror(fp)) {
(void) fclose(fp);
(void) close(ptmpfd);
pw_abort();
err(EXIT_FAILURE, "read error on %s", _PATH_MASTERPASSWD);
}
}
if (up->u_flags & F_MKDIR) {
if (lstat(home, &st) == 0) {
(void) close(ptmpfd);
pw_abort();
errx(EXIT_FAILURE, "home directory `%s' already exists",
home);
} else {
if (asystem("%s -p %s", MKDIR, home) != 0) {
(void) close(ptmpfd);
pw_abort();
err(EXIT_FAILURE, "can't mkdir `%s'", home);
}
(void) copydotfiles(up->u_skeldir, up->u_uid, gid, home);
}
}
if (strcmp(up->u_primgrp, "=uid") == 0 &&
getgrnam(login_name) == NULL &&
!creategid(login_name, gid, login_name)) {
(void) close(ptmpfd);
pw_abort();
errx(EXIT_FAILURE, "can't create gid %d for login name %s",
gid, login_name);
}
if (up->u_groupc > 0 && !append_group(login_name, up->u_groupc, up->u_groupv)) {
(void) close(ptmpfd);
pw_abort();
errx(EXIT_FAILURE, "can't append `%s' to new groups", login_name);
}
(void) close(ptmpfd);
if (pw_mkdb(yp ? NULL : login_name, 0) < 0) {
pw_abort();
err(EXIT_FAILURE, "pw_mkdb failed");
}
syslog(LOG_INFO, "new user added: name=%s, uid=%d, gid=%d, home=%s, shell=%s",
login_name, up->u_uid, gid, home, up->u_shell);
return 1;
}
/* remove a user from the groups file */
static int
rm_user_from_groups(char *login_name)
{
struct stat st;
size_t login_len;
FILE *from;
FILE *to;
char buf[LINE_MAX];
char f[MaxFileNameLen];
char *cp, *ep;
int fd;
int cc;
login_len = strlen(login_name);
if ((from = fopen(_PATH_GROUP, "r")) == NULL) {
warn("can't remove gid for `%s': can't open `%s'",
login_name, _PATH_GROUP);
return 0;
}
if (flock(fileno(from), LOCK_EX | LOCK_NB) < 0) {
warn("can't lock `%s'", _PATH_GROUP);
}
(void) fstat(fileno(from), &st);
(void) snprintf(f, sizeof(f), "%s.XXXXXXXX", _PATH_GROUP);
if ((fd = mkstemp(f)) < 0) {
(void) fclose(from);
warn("can't remove gid for `%s': mkstemp failed", login_name);
return 0;
}
if ((to = fdopen(fd, "w")) == NULL) {
(void) fclose(from);
(void) close(fd);
(void) unlink(f);
warn("can't remove gid for `%s': fdopen `%s' failed",
login_name, f);
return 0;
}
while (fgets(buf, sizeof(buf), from) > 0) {
cc = strlen(buf);
if (cc > 0 && buf[cc - 1] != '\n' && !feof(from)) {
while (fgetc(from) != '\n' && !feof(from))
cc++;
warn("%s: line `%s' too long (%d bytes), skipping",
_PATH_GROUP, buf, cc);
continue;
}
/* Break out the group list. */
for (cp = buf, cc = 0; *cp != '\0' && cc < 3; cp++) {
if (*cp == ':')
cc++;
}
if (cc != 3) {
buf[strcspn(buf, "\n")] = '\0';
warnx("Malformed entry `%s'. Skipping", buf);
continue;
}
while ((cp = strstr(cp, login_name)) != NULL) {
if ((cp[-1] == ':' || cp[-1] == ',') &&
(cp[login_len] == ',' || cp[login_len] == '\n')) {
ep = cp + login_len;
if (cp[login_len] == ',')
ep++;
else if (cp[-1] == ',')
cp--;
memmove(cp, ep, strlen(ep) + 1);
} else {
if ((cp = strchr(cp, ',')) == NULL)
break;
cp++;
}
}
if (fwrite(buf, strlen(buf), 1, to) != 1) {
(void) fclose(from);
(void) fclose(to);
(void) unlink(f);
warn("can't remove gid for `%s': short write to `%s'",
login_name, f);
return 0;
}
}
(void) fchmod(fileno(to), st.st_mode & 07777);
(void) fclose(from);
if (fclose(to) == EOF) {
(void) unlink(f);
warn("can't remove gid for `%s': short write to `%s'",
login_name, f);
return 0;
}
if (rename(f, _PATH_GROUP) < 0) {
(void) unlink(f);
warn("can't remove gid for `%s': can't rename `%s' to `%s'",
login_name, f, _PATH_GROUP);
return 0;
}
return 1;
}
/* check that the user or group is local, not from YP/NIS */
static int
is_local(char *name, const char *file)
{
FILE *fp;
char buf[LINE_MAX];
size_t len;
int ret;
int cc;
if ((fp = fopen(file, "r")) == NULL) {
err(EXIT_FAILURE, "can't open `%s'", file);
}
len = strlen(name);
for (ret = 0 ; fgets(buf, sizeof(buf), fp) != NULL ; ) {
cc = strlen(buf);
if (cc > 0 && buf[cc - 1] != '\n' && !feof(fp)) {
while (fgetc(fp) != '\n' && !feof(fp))
cc++;
warn("%s: line `%s' too long (%d bytes), skipping",
file, buf, cc);
continue;
}
if (strncmp(buf, name, len) == 0 && buf[len] == ':') {
ret = 1;
break;
}
}
(void) fclose(fp);
return ret;
}
/* modify a user */
static int
moduser(char *login_name, char *newlogin, user_t *up)
{
struct passwd *pwp;
struct group *grp;
const char *homedir;
char buf[LINE_MAX];
size_t colonc, loginc;
size_t cc;
FILE *master;
char newdir[MaxFileNameLen];
char *colon;
int len;
int masterfd;
int ptmpfd;
int rval;
if (!valid_login(newlogin)) {
errx(EXIT_FAILURE, "`%s' is not a valid login name", login_name);
}
if ((pwp = getpwnam(login_name)) == NULL) {
errx(EXIT_FAILURE, "No such user `%s'", login_name);
}
if (!is_local(login_name, _PATH_MASTERPASSWD)) {
errx(EXIT_FAILURE, "User `%s' must be a local user", login_name);
}
/* keep dir name in case we need it for '-m' */
homedir = pwp->pw_dir;
if ((masterfd = open(_PATH_MASTERPASSWD, O_RDONLY)) < 0) {
err(EXIT_FAILURE, "can't open `%s'", _PATH_MASTERPASSWD);
}
if (flock(masterfd, LOCK_EX | LOCK_NB) < 0) {
err(EXIT_FAILURE, "can't lock `%s'", _PATH_MASTERPASSWD);
}
pw_init();
if ((ptmpfd = pw_lock(WAITSECS)) < 0) {
(void) close(masterfd);
err(EXIT_FAILURE, "can't obtain pw_lock");
}
if ((master = fdopen(masterfd, "r")) == NULL) {
(void) close(masterfd);
(void) close(ptmpfd);
pw_abort();
err(EXIT_FAILURE, "can't fdopen fd for %s", _PATH_MASTERPASSWD);
}
if (up != NULL) {
if (up->u_flags & F_USERNAME) {
/* if changing name, check new name isn't already in use */
if (strcmp(login_name, newlogin) != 0 && getpwnam(newlogin) != NULL) {
(void) close(ptmpfd);
pw_abort();
errx(EXIT_FAILURE, "already a `%s' user", newlogin);
}
pwp->pw_name = newlogin;
/*
* Provide a new directory name in case the
* home directory is to be moved.
*/
if (up->u_flags & F_MKDIR) {
(void) snprintf(newdir, sizeof(newdir),
"%s/%s", up->u_basedir, newlogin);
pwp->pw_dir = newdir;
}
}
if (up->u_flags & F_PASSWORD) {
if (up->u_password != NULL) {
if (!valid_password_length(up->u_password)) {
(void) close(ptmpfd);
pw_abort();
errx(EXIT_FAILURE, "Invalid password: `%s'",
up->u_password);
}
pwp->pw_passwd = up->u_password;
}
}
if (up->u_flags & F_UID) {
/* check uid isn't already allocated */
if (!(up->u_flags & F_DUPUID) && getpwuid((uid_t)(up->u_uid)) != NULL) {
(void) close(ptmpfd);
pw_abort();
errx(EXIT_FAILURE, "uid %u is already in use", up->u_uid);
}
pwp->pw_uid = up->u_uid;
}
if (up->u_flags & F_GROUP) {
/* if -g=uid was specified, check gid is unused */
if (strcmp(up->u_primgrp, "=uid") == 0) {
if (getgrgid((gid_t)(up->u_uid)) != NULL) {
(void) close(ptmpfd);
pw_abort();
errx(EXIT_FAILURE, "gid %u is already in use", up->u_uid);
}
pwp->pw_gid = up->u_uid;
} else if ((grp = getgrnam(up->u_primgrp)) != NULL) {
pwp->pw_gid = grp->gr_gid;
} else if (is_number(up->u_primgrp) &&
(grp = getgrgid((gid_t)atoi(up->u_primgrp))) != NULL) {
pwp->pw_gid = grp->gr_gid;
} else {
(void) close(ptmpfd);
pw_abort();
errx(EXIT_FAILURE, "group %s not found", up->u_primgrp);
}
}
if (up->u_flags & F_INACTIVE) {
if (!scantime(&pwp->pw_change, up->u_inactive)) {
warnx("Warning: inactive time `%s' invalid, password expiry off",
up->u_inactive);
}
}
if (up->u_flags & F_EXPIRE) {
if (!scantime(&pwp->pw_expire, up->u_expire)) {
warnx("Warning: expire time `%s' invalid, account expiry off",
up->u_expire);
}
}
if (up->u_flags & F_COMMENT)
pwp->pw_gecos = up->u_comment;
if (up->u_flags & F_HOMEDIR)
pwp->pw_dir = up->u_home;
if (up->u_flags & F_SHELL)
pwp->pw_shell = up->u_shell;
#ifdef EXTENSIONS
if (up->u_flags & F_CLASS) {
if (!valid_class(up->u_class)) {
(void) close(ptmpfd);
pw_abort();
errx(EXIT_FAILURE,
"No such login class `%s'", up->u_class);
}
pwp->pw_class = up->u_class;
}
#endif
}
loginc = strlen(login_name);
while (fgets(buf, sizeof(buf), master) != NULL) {
if ((colon = strchr(buf, ':')) == NULL) {
warnx("Malformed entry `%s'. Skipping", buf);
continue;
}
colonc = (size_t)(colon - buf);
if (strncmp(login_name, buf, loginc) == 0 && loginc == colonc) {
if (up != NULL) {
if ((len = snprintf(buf, sizeof(buf),
"%s:%s:%d:%d:%s:%ld:%ld:%s:%s:%s\n",
newlogin,
pwp->pw_passwd,
pwp->pw_uid,
pwp->pw_gid,
#ifdef EXTENSIONS
pwp->pw_class,
#else
"",
#endif
(long)pwp->pw_change,
(long)pwp->pw_expire,
pwp->pw_gecos,
pwp->pw_dir,
pwp->pw_shell)) >= sizeof(buf) || len < 0 ||
len + expand_len(pwp->pw_gecos, newlogin)
>= 1023) {
(void) close(ptmpfd);
pw_abort();
errx(EXIT_FAILURE, "can't add `%s', "
"line too long (%d bytes)", buf,
len + expand_len(pwp->pw_gecos,
newlogin));
}
if (write(ptmpfd, buf, len) != len) {
(void) close(ptmpfd);
pw_abort();
err(EXIT_FAILURE, "can't add `%s'", buf);
}
}
} else {
len = strlen(buf);
if ((cc = write(ptmpfd, buf, len)) != len) {
(void) close(masterfd);
(void) close(ptmpfd);
pw_abort();
err(EXIT_FAILURE, "short write to /etc/ptmp (%lld not %lld chars)",
(long long)cc, (long long)len);
}
}
}
if (up != NULL) {
if ((up->u_flags & F_MKDIR) &&
asystem("%s %s %s", MV, homedir, pwp->pw_dir) != 0) {
(void) close(ptmpfd);
pw_abort();
err(EXIT_FAILURE, "can't move `%s' to `%s'",
homedir, pwp->pw_dir);
}
if (up->u_groupc > 0 &&
!append_group(newlogin, up->u_groupc, up->u_groupv)) {
(void) close(ptmpfd);
pw_abort();
errx(EXIT_FAILURE, "can't append `%s' to new groups",
newlogin);
}
}
(void) close(ptmpfd);
if (up != NULL && strcmp(login_name, newlogin) == 0)
rval = pw_mkdb(login_name, 0);
else
rval = pw_mkdb(NULL, 0);
if (rval == -1) {
pw_abort();
err(EXIT_FAILURE, "pw_mkdb failed");
}
if (up == NULL) {
syslog(LOG_INFO, "user removed: name=%s", login_name);
} else if (strcmp(login_name, newlogin) == 0) {
syslog(LOG_INFO, "user information modified: name=%s, uid=%d, gid=%d, home=%s, shell=%s",
login_name, pwp->pw_uid, pwp->pw_gid, pwp->pw_dir, pwp->pw_shell);
} else {
syslog(LOG_INFO, "user information modified: name=%s, new name=%s, uid=%d, gid=%d, home=%s, shell=%s",
login_name, newlogin, pwp->pw_uid, pwp->pw_gid, pwp->pw_dir, pwp->pw_shell);
}
return 1;
}
#ifdef EXTENSIONS
/* see if we can find out the user struct */
static struct passwd *
find_user_info(char *name)
{
struct passwd *pwp;
if ((pwp = getpwnam(name)) != NULL) {
return pwp;
}
if (is_number(name) && (pwp = getpwuid((uid_t)atoi(name))) != NULL) {
return pwp;
}
return NULL;
}
#endif
#ifdef EXTENSIONS
/* see if we can find out the group struct */
static struct group *
find_group_info(char *name)
{
struct group *grp;
if ((grp = getgrnam(name)) != NULL) {
return grp;
}
if (is_number(name) && (grp = getgrgid((gid_t)atoi(name))) != NULL) {
return grp;
}
return NULL;
}
#endif
/* print out usage message, and then exit */
void
usermgmt_usage(const char *prog)
{
if (strcmp(prog, "useradd") == 0) {
(void) fprintf(stderr, "usage: %s -D [-b base-directory] "
"[-e expiry-time] [-f inactive-time]\n"
" [-g gid | name | =uid] [-k skel-directory] "
"[-L login-class]\n"
" [-r low..high] [-s shell]\n", prog);
(void) fprintf(stderr, " %s [-mov] [-b base-directory] "
"[-c comment] [-d home-directory]\n"
" [-e expiry-time] [-f inactive-time]\n"
" [-G secondary-group[,group,...]] "
"[-g gid | name | =uid]\n"
" [-k skel-directory] [-L login-class] "
"[-p password] [-r low..high]\n"
" [-s shell] [-u uid] user\n", prog);
} else if (strcmp(prog, "usermod") == 0) {
(void) fprintf(stderr, "usage: %s [-mov] "
"[-G secondary-group[,group,...]] [-c comment]\n"
" [-d home-directory] [-e expiry-time] "
"[-f inactive-time]\n"
" [-g gid | name | =uid] [-L login-class] "
"[-l new-login]\n"
" [-p password] [-s shell] [-u uid] user\n",
prog);
} else if (strcmp(prog, "userdel") == 0) {
(void) fprintf(stderr, "usage: %s -D [-p preserve-value]\n",
prog);
(void) fprintf(stderr, " %s [-prv] user\n", prog);
#ifdef EXTENSIONS
} else if (strcmp(prog, "userinfo") == 0) {
(void) fprintf(stderr, "usage: %s [-e] user\n", prog);
#endif
} else if (strcmp(prog, "groupadd") == 0) {
(void) fprintf(stderr, "usage: %s [-ov] [-g gid] group\n",
prog);
} else if (strcmp(prog, "groupdel") == 0) {
(void) fprintf(stderr, "usage: %s [-v] group\n", prog);
} else if (strcmp(prog, "groupmod") == 0) {
(void) fprintf(stderr, "usage: %s [-ov] [-g gid] [-n newname] "
"group\n", prog);
} else if (strcmp(prog, "user") == 0 || strcmp(prog, "group") == 0) {
(void) fprintf(stderr, "usage: %s [add | del | mod"
#ifdef EXTENSIONS
" | info"
#endif
"] ...\n",
prog);
#ifdef EXTENSIONS
} else if (strcmp(prog, "groupinfo") == 0) {
(void) fprintf(stderr, "usage: %s [-e] group\n", prog);
#endif
} else {
(void) fprintf(stderr, "This program must be called as {user,group}{add,del,mod,info},\n%s is not an understood name.\n", prog);
}
exit(EXIT_FAILURE);
/* NOTREACHED */
}
#ifdef EXTENSIONS
#define ADD_OPT_EXTENSIONS "p:r:vL:"
#else
#define ADD_OPT_EXTENSIONS
#endif
int
useradd(int argc, char **argv)
{
user_t u;
int defaultfield;
int bigD;
int c;
#ifdef EXTENSIONS
int i;
#endif
(void) memset(&u, 0, sizeof(u));
read_defaults(&u);
u.u_uid = UID_MAX;
defaultfield = bigD = 0;
while ((c = getopt(argc, argv, "DG:b:c:d:e:f:g:k:mou:s:" ADD_OPT_EXTENSIONS)) != -1) {
switch(c) {
case 'D':
bigD = 1;
break;
case 'G':
while ((u.u_groupv[u.u_groupc] = strsep(&optarg, ",")) != NULL &&
u.u_groupc < NGROUPS_MAX - 2) {
if (u.u_groupv[u.u_groupc][0] != 0) {
u.u_groupc++;
}
}
if (optarg != NULL) {
warnx("Truncated list of secondary groups to %d entries", NGROUPS_MAX - 2);
}
break;
case 'b':
defaultfield = 1;
memsave(&u.u_basedir, optarg, strlen(optarg));
break;
case 'c':
memsave(&u.u_comment, optarg, strlen(optarg));
break;
case 'd':
memsave(&u.u_home, optarg, strlen(optarg));
u.u_flags |= F_HOMEDIR;
break;
case 'e':
defaultfield = 1;
memsave(&u.u_expire, optarg, strlen(optarg));
break;
case 'f':
defaultfield = 1;
memsave(&u.u_inactive, optarg, strlen(optarg));
break;
case 'g':
defaultfield = 1;
memsave(&u.u_primgrp, optarg, strlen(optarg));
break;
case 'k':
defaultfield = 1;
memsave(&u.u_skeldir, optarg, strlen(optarg));
break;
#ifdef EXTENSIONS
case 'L':
defaultfield = 1;
memsave(&u.u_class, optarg, strlen(optarg));
break;
#endif
case 'm':
u.u_flags |= F_MKDIR;
break;
case 'o':
u.u_flags |= F_DUPUID;
break;
#ifdef EXTENSIONS
case 'p':
memsave(&u.u_password, optarg, strlen(optarg));
memset(optarg, 'X', strlen(optarg));
break;
#endif
#ifdef EXTENSIONS
case 'r':
defaultfield = 1;
(void) save_range(&u, optarg);
break;
#endif
case 's':
defaultfield = 1;
memsave(&u.u_shell, optarg, strlen(optarg));
break;
case 'u':
if (!is_number(optarg)) {
errx(EXIT_FAILURE, "When using [-u uid], the uid must be numeric");
}
u.u_uid = atoi(optarg);
break;
#ifdef EXTENSIONS
case 'v':
verbose = 1;
break;
#endif
default:
usermgmt_usage("useradd");
/* NOTREACHED */
}
}
if (bigD) {
if (defaultfield) {
checkeuid();
return setdefaults(&u) ? EXIT_SUCCESS : EXIT_FAILURE;
}
(void) printf("group\t\t%s\n", u.u_primgrp);
(void) printf("base_dir\t%s\n", u.u_basedir);
(void) printf("skel_dir\t%s\n", u.u_skeldir);
(void) printf("shell\t\t%s\n", u.u_shell);
#ifdef EXTENSIONS
(void) printf("class\t\t%s\n", u.u_class);
#endif
(void) printf("inactive\t%s\n", (u.u_inactive == NULL) ? UNSET_INACTIVE : u.u_inactive);
(void) printf("expire\t\t%s\n", (u.u_expire == NULL) ? UNSET_EXPIRY : u.u_expire);
#ifdef EXTENSIONS
for (i = 0 ; i < u.u_rc ; i++) {
(void) printf("range\t\t%d..%d\n", u.u_rv[i].r_from, u.u_rv[i].r_to);
}
#endif
return EXIT_SUCCESS;
}
argc -= optind;
argv += optind;
if (argc != 1) {
usermgmt_usage("useradd");
}
checkeuid();
openlog("useradd", LOG_PID, LOG_USER);
return adduser(*argv, &u) ? EXIT_SUCCESS : EXIT_FAILURE;
}
#ifdef EXTENSIONS
#define MOD_OPT_EXTENSIONS "p:vL:"
#else
#define MOD_OPT_EXTENSIONS
#endif
int
usermod(int argc, char **argv)
{
user_t u;
char newuser[MaxUserNameLen + 1];
int c, have_new_user;
(void) memset(&u, 0, sizeof(u));
(void) memset(newuser, 0, sizeof(newuser));
read_defaults(&u);
free(u.u_primgrp);
u.u_primgrp = NULL;
have_new_user = 0;
while ((c = getopt(argc, argv, "G:c:d:e:f:g:l:mos:u:" MOD_OPT_EXTENSIONS)) != -1) {
switch(c) {
case 'G':
while ((u.u_groupv[u.u_groupc] = strsep(&optarg, ",")) != NULL &&
u.u_groupc < NGROUPS_MAX - 2) {
if (u.u_groupv[u.u_groupc][0] != 0) {
u.u_groupc++;
}
}
if (optarg != NULL) {
warnx("Truncated list of secondary groups to %d entries", NGROUPS_MAX - 2);
}
u.u_flags |= F_SECGROUP;
break;
case 'c':
memsave(&u.u_comment, optarg, strlen(optarg));
u.u_flags |= F_COMMENT;
break;
case 'd':
memsave(&u.u_home, optarg, strlen(optarg));
u.u_flags |= F_HOMEDIR;
break;
case 'e':
memsave(&u.u_expire, optarg, strlen(optarg));
u.u_flags |= F_EXPIRE;
break;
case 'f':
memsave(&u.u_inactive, optarg, strlen(optarg));
u.u_flags |= F_INACTIVE;
break;
case 'g':
memsave(&u.u_primgrp, optarg, strlen(optarg));
u.u_flags |= F_GROUP;
break;
case 'l':
if (strlcpy(newuser, optarg, sizeof(newuser)) >=
sizeof(newuser))
errx(EXIT_FAILURE, "username `%s' too long",
optarg);
have_new_user = 1;
u.u_flags |= F_USERNAME;
break;
#ifdef EXTENSIONS
case 'L':
memsave(&u.u_class, optarg, strlen(optarg));
u.u_flags |= F_CLASS;
break;
#endif
case 'm':
u.u_flags |= F_MKDIR;
break;
case 'o':
u.u_flags |= F_DUPUID;
break;
#ifdef EXTENSIONS
case 'p':
memsave(&u.u_password, optarg, strlen(optarg));
memset(optarg, 'X', strlen(optarg));
u.u_flags |= F_PASSWORD;
break;
#endif
case 's':
memsave(&u.u_shell, optarg, strlen(optarg));
u.u_flags |= F_SHELL;
break;
case 'u':
if (!is_number(optarg)) {
errx(EXIT_FAILURE, "When using [-u uid], the uid must be numeric");
}
u.u_uid = atoi(optarg);
u.u_flags |= F_UID;
break;
#ifdef EXTENSIONS
case 'v':
verbose = 1;
break;
#endif
default:
usermgmt_usage("usermod");
/* NOTREACHED */
}
}
if ((u.u_flags & F_MKDIR) && !(u.u_flags & F_HOMEDIR) &&
!(u.u_flags & F_USERNAME)) {
warnx("option 'm' useless without 'd' or 'l' -- ignored");
u.u_flags &= ~F_MKDIR;
}
argc -= optind;
argv += optind;
if (argc != 1) {
usermgmt_usage("usermod");
}
checkeuid();
openlog("usermod", LOG_PID, LOG_USER);
return moduser(*argv, (have_new_user) ? newuser : *argv, &u) ?
EXIT_SUCCESS : EXIT_FAILURE;
}
#ifdef EXTENSIONS
#define DEL_OPT_EXTENSIONS "Dp:v"
#else
#define DEL_OPT_EXTENSIONS
#endif
int
userdel(int argc, char **argv)
{
struct passwd *pwp;
user_t u;
char password[PasswordLength + 1];
int defaultfield;
int rmhome;
int bigD;
int c;
(void) memset(&u, 0, sizeof(u));
read_defaults(&u);
defaultfield = bigD = rmhome = 0;
while ((c = getopt(argc, argv, "r" DEL_OPT_EXTENSIONS)) != -1) {
switch(c) {
#ifdef EXTENSIONS
case 'D':
bigD = 1;
break;
#endif
#ifdef EXTENSIONS
case 'p':
defaultfield = 1;
u.u_preserve = (strcmp(optarg, "true") == 0) ? 1 :
(strcmp(optarg, "yes") == 0) ? 1 :
atoi(optarg);
break;
#endif
case 'r':
rmhome = 1;
break;
#ifdef EXTENSIONS
case 'v':
verbose = 1;
break;
#endif
default:
usermgmt_usage("userdel");
/* NOTREACHED */
}
}
#ifdef EXTENSIONS
if (bigD) {
if (defaultfield) {
checkeuid();
return setdefaults(&u) ? EXIT_SUCCESS : EXIT_FAILURE;
}
(void) printf("preserve\t%s\n", (u.u_preserve) ? "true" : "false");
return EXIT_SUCCESS;
}
#endif
argc -= optind;
argv += optind;
if (argc != 1) {
usermgmt_usage("userdel");
}
checkeuid();
if ((pwp = getpwnam(*argv)) == NULL) {
warnx("No such user `%s'", *argv);
return EXIT_FAILURE;
}
if (rmhome)
(void)removehomedir(pwp->pw_name, pwp->pw_uid, pwp->pw_dir);
if (u.u_preserve) {
u.u_flags |= F_SHELL;
memsave(&u.u_shell, NOLOGIN, strlen(NOLOGIN));
(void) memset(password, '*', DES_Len);
password[DES_Len] = 0;
memsave(&u.u_password, password, strlen(password));
u.u_flags |= F_PASSWORD;
openlog("userdel", LOG_PID, LOG_USER);
return moduser(*argv, *argv, &u) ? EXIT_SUCCESS : EXIT_FAILURE;
}
if (!rm_user_from_groups(*argv)) {
return 0;
}
openlog("userdel", LOG_PID, LOG_USER);
return moduser(*argv, *argv, NULL) ? EXIT_SUCCESS : EXIT_FAILURE;
}
#ifdef EXTENSIONS
#define GROUP_ADD_OPT_EXTENSIONS "v"
#else
#define GROUP_ADD_OPT_EXTENSIONS
#endif
/* add a group */
int
groupadd(int argc, char **argv)
{
int dupgid;
int gid;
int c;
gid = GID_MAX;
dupgid = 0;
while ((c = getopt(argc, argv, "g:o" GROUP_ADD_OPT_EXTENSIONS)) != -1) {
switch(c) {
case 'g':
if (!is_number(optarg)) {
errx(EXIT_FAILURE, "When using [-g gid], the gid must be numeric");
}
gid = atoi(optarg);
break;
case 'o':
dupgid = 1;
break;
#ifdef EXTENSIONS
case 'v':
verbose = 1;
break;
#endif
default:
usermgmt_usage("groupadd");
/* NOTREACHED */
}
}
argc -= optind;
argv += optind;
if (argc != 1) {
usermgmt_usage("groupadd");
}
checkeuid();
if (!valid_group(*argv)) {
errx(EXIT_FAILURE, "invalid group name `%s'", *argv);
}
if (gid < 0 && !getnextgid(&gid, LowGid, HighGid)) {
errx(EXIT_FAILURE, "can't add group: can't get next gid");
}
if (!dupgid && getgrgid((gid_t) gid) != NULL) {
errx(EXIT_FAILURE, "can't add group: gid %d is a duplicate", gid);
}
openlog("groupadd", LOG_PID, LOG_USER);
if (!creategid(*argv, gid, "")) {
errx(EXIT_FAILURE, "can't add group: problems with %s file",
_PATH_GROUP);
}
return EXIT_SUCCESS;
}
#ifdef EXTENSIONS
#define GROUP_DEL_OPT_EXTENSIONS "v"
#else
#define GROUP_DEL_OPT_EXTENSIONS
#endif
/* remove a group */
int
groupdel(int argc, char **argv)
{
int c;
while ((c = getopt(argc, argv, "" GROUP_DEL_OPT_EXTENSIONS)) != -1) {
switch(c) {
#ifdef EXTENSIONS
case 'v':
verbose = 1;
break;
#endif
default:
usermgmt_usage("groupdel");
/* NOTREACHED */
}
}
argc -= optind;
argv += optind;
if (argc != 1) {
usermgmt_usage("groupdel");
}
checkeuid();
openlog("groupdel", LOG_PID, LOG_USER);
if (getgrnam(*argv) == NULL) {
warnx("No such group: `%s'", *argv);
return EXIT_FAILURE;
}
if (!modify_gid(*argv, NULL)) {
err(EXIT_FAILURE, "can't change %s file", _PATH_GROUP);
}
return EXIT_SUCCESS;
}
#ifdef EXTENSIONS
#define GROUP_MOD_OPT_EXTENSIONS "v"
#else
#define GROUP_MOD_OPT_EXTENSIONS
#endif
/* modify a group */
int
groupmod(int argc, char **argv)
{
struct group *grp;
char buf[LINE_MAX];
char *newname;
char **cpp;
int dupgid;
int gid;
int cc;
int c;
gid = GID_MAX;
dupgid = 0;
newname = NULL;
while ((c = getopt(argc, argv, "g:on:" GROUP_MOD_OPT_EXTENSIONS)) != -1) {
switch(c) {
case 'g':
if (!is_number(optarg)) {
errx(EXIT_FAILURE, "When using [-g gid], the gid must be numeric");
}
gid = atoi(optarg);
break;
case 'o':
dupgid = 1;
break;
case 'n':
memsave(&newname, optarg, strlen(optarg));
break;
#ifdef EXTENSIONS
case 'v':
verbose = 1;
break;
#endif
default:
usermgmt_usage("groupmod");
/* NOTREACHED */
}
}
argc -= optind;
argv += optind;
if (argc != 1) {
usermgmt_usage("groupmod");
}
checkeuid();
if (gid < 0 && newname == NULL) {
errx(EXIT_FAILURE, "Nothing to change");
}
if (dupgid && gid < 0) {
errx(EXIT_FAILURE, "Duplicate which gid?");
}
if ((grp = getgrnam(*argv)) == NULL) {
errx(EXIT_FAILURE, "can't find group `%s' to modify", *argv);
}
if (!is_local(*argv, _PATH_GROUP)) {
errx(EXIT_FAILURE, "Group `%s' must be a local group", *argv);
}
if (newname != NULL && !valid_group(newname)) {
errx(EXIT_FAILURE, "invalid group name `%s'", newname);
}
if ((cc = snprintf(buf, sizeof(buf), "%s:%s:%u:",
(newname) ? newname : grp->gr_name, grp->gr_passwd,
(gid < 0) ? grp->gr_gid : gid)) >= sizeof(buf) || cc < 0)
errx(EXIT_FAILURE, "group `%s' entry too long", grp->gr_name);
for (cpp = grp->gr_mem ; *cpp ; cpp++) {
cc = strlcat(buf, *cpp, sizeof(buf)) + 1;
if (cc >= sizeof(buf))
errx(EXIT_FAILURE, "group `%s' entry too long",
grp->gr_name);
if (cpp[1] != NULL) {
buf[cc - 1] = ',';
buf[cc] = '\0';
}
}
cc = strlcat(buf, "\n", sizeof(buf));
if (cc >= sizeof(buf))
errx(EXIT_FAILURE, "group `%s' entry too long", grp->gr_name);
openlog("groupmod", LOG_PID, LOG_USER);
if (!modify_gid(*argv, buf))
err(EXIT_FAILURE, "can't change %s file", _PATH_GROUP);
return EXIT_SUCCESS;
}
#ifdef EXTENSIONS
/* display user information */
int
userinfo(int argc, char **argv)
{
struct passwd *pwp;
struct group *grp;
char **cpp;
int exists;
int i;
exists = 0;
while ((i = getopt(argc, argv, "ev")) != -1) {
switch(i) {
case 'e':
exists = 1;
break;
case 'v':
verbose = 1;
break;
default:
usermgmt_usage("userinfo");
/* NOTREACHED */
}
}
argc -= optind;
argv += optind;
if (argc != 1) {
usermgmt_usage("userinfo");
}
pwp = find_user_info(*argv);
if (exists) {
exit((pwp) ? EXIT_SUCCESS : EXIT_FAILURE);
}
if (pwp == NULL) {
errx(EXIT_FAILURE, "can't find user `%s'", *argv);
}
(void) printf("login\t%s\n", pwp->pw_name);
(void) printf("passwd\t%s\n", pwp->pw_passwd);
(void) printf("uid\t%u\n", pwp->pw_uid);
if ((grp = getgrgid(pwp->pw_gid)) == NULL)
(void) printf("groups\t%u", pwp->pw_gid);
else
(void) printf("groups\t%s", grp->gr_name);
while ((grp = getgrent()) != NULL) {
for (cpp = grp->gr_mem ; *cpp ; cpp++) {
if (strcmp(*cpp, pwp->pw_name) == 0 &&
grp->gr_gid != pwp->pw_gid)
(void) printf(" %s", grp->gr_name);
}
}
(void) fputc('\n', stdout);
(void) printf("change\t%s", pwp->pw_change ? ctime(&pwp->pw_change) : "NEVER\n");
#ifdef EXTENSIONS
(void) printf("class\t%s\n", pwp->pw_class);
#endif
(void) printf("gecos\t%s\n", pwp->pw_gecos);
(void) printf("dir\t%s\n", pwp->pw_dir);
(void) printf("shell\t%s\n", pwp->pw_shell);
(void) printf("expire\t%s", pwp->pw_expire ? ctime(&pwp->pw_expire) : "NEVER\n");
return EXIT_SUCCESS;
}
#endif
#ifdef EXTENSIONS
/* display user information */
int
groupinfo(int argc, char **argv)
{
struct group *grp;
char **cpp;
int exists;
int i;
exists = 0;
while ((i = getopt(argc, argv, "ev")) != -1) {
switch(i) {
case 'e':
exists = 1;
break;
case 'v':
verbose = 1;
break;
default:
usermgmt_usage("groupinfo");
/* NOTREACHED */
}
}
argc -= optind;
argv += optind;
if (argc != 1) {
usermgmt_usage("groupinfo");
}
grp = find_group_info(*argv);
if (exists) {
exit((grp) ? EXIT_SUCCESS : EXIT_FAILURE);
}
if (grp == NULL) {
errx(EXIT_FAILURE, "can't find group `%s'", *argv);
}
(void) printf("name\t%s\n", grp->gr_name);
(void) printf("passwd\t%s\n", grp->gr_passwd);
(void) printf("gid\t%u\n", grp->gr_gid);
(void) printf("members\t");
for (cpp = grp->gr_mem ; *cpp ; cpp++) {
(void) printf("%s ", *cpp);
}
(void) fputc('\n', stdout);
return EXIT_SUCCESS;
}
#endif